84 



NOAA Technical Report NMFS 140 



co < 



2o 



\~~\ NUMBER 

 WB WEIGHT 



n r n 



GRAVEL TILL SHELL SAND SAND- SILT- 



SILT CLAY 



BOTTOM SEDIMENTS 



Figure 48 

 Density and biomass of Zoantharia in relation to bottom sediments. 



Relation to Water Temperature 



Turbellarians occurred in all temperature range classes 

 except one (Tables 21-25; Fig. 55). They were absent 

 from samples representing areas where the tempera- 

 ture change was less than 4°C. Their density, biomass, 

 and frequency of occurrence in all temperature range 

 classes in which the) occurred were quantitatively low 

 and roughly equal from class to class. 



Relation In Ssediment Organic Carbon 



Turbellarians occurred in three organic carbon con- 

 tent classes, two in the low range and one in the moder- 

 ately liigli range (Fig. 56). Densities ranged from 0.1 to 

 0.9 individual/ m 2 (Tables 26, 27), and biomasses ranged 

 from <0.01 to 0.19 g/m- (Tables 28, 29). Frequency of 

 occurrence in samples ranged from 1 to 8% (Table 30). 

 In all measures of abundance highest values occurred 



